SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37fb1a67321cd02012dd5ca8d19c5fa0d048714733fe953f3f89552f806afab2' 
  AND token = 'wn3rKxJb1RPBvMts8Jev0ExmkUzznbjQ9Fsim/ovZLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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