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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ef15379398760ac6b815be67ad26310ab99cb61ec5232f80214d7b16636a3a4' 
  AND token = 'beCZNR3Y+pLiZS48EDALXYJubYmiBm+Xr/2V1uy1Ln0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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