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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '638de908e69d1fcff5ae37c44f299f27e43f07b4de13acdcee8cc1654c1048b3' 
  AND token = 'XJ+S4xopCQ0NkXYtEN6vo8cyHlxAeKeeZFCY2AQXpHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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