SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44d0c5cef78b1934ab221ff31ba55a0c95966a1801a75325d5068e27d0de4f37' 
  AND token = '+NSQErN4MGIvIKyPDvFxE0IWv/ELYoT1LZGT6hzpDMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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