SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11dd2a586caa2cfaabb26693ba29edef0d89c0b225792d81cf42e84e594417f4' 
  AND token = 'GW8pgHwLB9glhNlIrzSfU3VDUDDJBL7Z2A/EFnMj4NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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