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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8274aafac455aa49ff0ae2694b7be1afa21beca90f634497b22e17270224e3dc' 
  AND token = 'aDX8YsEPfn9D8LjVpKR5fpAOCEsjzNIEtRgapzw+njw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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