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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bae32aff2d8c57f637cfe54ebb58e2d978a71e903f421f74fbaeb78f51e127d3' 
  AND token = 'XNC7JESXX2WpbFncJRhjRMLOQFMuJwh3gp5C4IG4YtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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