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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed913452cb4fdc61cb01436c400b76057ef8344ed2d34491904bd5664062daeb' 
  AND token = 'fmdaJt4dkDBSWtqVCW8Kfu0fX+LMjw66K1VetboD1nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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