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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f633ee8625dfc5fef6ee4d605f72fea9d9b2b8f452fed825388cc4bb99e7d8f7' 
  AND token = 'Ml+XNXt1tQKj6pRO09l5qxBVZGbAJ/QqkPEEpcobRso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}