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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dc09b2cbe77d962f93d28bd0f27a1c08daef01875ca805782b683418a5d6bc0' 
  AND token = 'Gw96f6wkYdfdHKgkWmP1klPrcxfBoISL7SC4NdJwu4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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