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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cc890361228ffd44a5937922b2e36a94369018031b0354fd44f24cbdd4fb0c1' 
  AND token = 'Y9YgYY7s4hYJdL5sgAiNP2cR91WZJh2mzUB3T0DxWEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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