SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5f02c3d13ffa557f17a8fb048945e38e23a115a92ac2b6962d164619b8edbb9' 
  AND token = 'J3vc/O2jHs172mjVJ9PjlP5mXpdyPWoDGBuI13CVjXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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