SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c70bcd514758cb566d5cd7b4c47f007ea262799b1a7863fc8a7e43df716e8970' 
  AND token = '38Ux/VvXkLi6WGzUNEsJm7ZhVOMXVUrXOrbwrsg8mWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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