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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff84f02154d7caff23570053af0576820ce4dea173be6e3433a21146e6039e4b' 
  AND token = 'jaiSRedsy5xFTB5UfGRWxGh+GPpevkRznru2KUlyZdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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