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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ff4b786df5655c83a82281199d085db1b9b59f6366a5e8f9c976299f86410c7' 
  AND token = '8N6xTYd27dKFcfev9sLkJnTgL7HnM20/Pf0ZqW2I+JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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