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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43f31eba66f29df8e293cf7460093c964eb18cf6fc241db4e0f1ee2cdc9a4c65' 
  AND token = 'VfFhgg11YQGtilv5YcVRflqSEsbaJJZuK5VScSMi3xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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