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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c765de8ee4c32943b38e46186fe3c87703a705247dc84269f9900182ede99356' 
  AND token = 'Jn9FtQrPkrSOcaFEggDKSOwFxNZ4VyddfIi76EV0kaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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