SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf1da9d51dbb993b41ab594815b4a16780ad2c2c666051c13261b685f47413ab' 
  AND token = 'ZtzMtolEGDNhYtzczoz9/fTuYmwXburVx7KlZYmUkFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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