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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe3707a7467b5960732b80be73e566aa37871c6e1188cb9e7dd82c42d1554b5a' 
  AND token = 'Rqeib6Cfwor6memozA455Lskk0BHf0h9OOV380haw3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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