SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ae8bc016b5a9cfe384871852130498549ed747136c5deceddcb05c443f0ce15' 
  AND token = 'V+hYa+3ujq4jIRvvoDxvpn+e28C0txaBvwUFaHJ3Cd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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