SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26875f5c23fd81ffdbe455a14794ac27bab8d060dacb9c9723cb89007448b0b6' 
  AND token = 'tgYrvhx6tUuuPSPmZ0J78TlhKFbHb95ROP4XdJ0BCeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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