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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1322f1acf243e1adcf814c842ae3422a56d1568cc1c853a0dbff65edc11d4917' 
  AND token = 'xj7Qak8JMCrMKn0NRKoOb63TMBadQCzpzTiWzmFtVoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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