SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b6a658b3ad97bdc2ef5268bb80e5dca4183a4eccbd12376ee0b31c550922090' 
  AND token = 'oDh2EyGqwq2r2v4sp2dudfJfVxhzj/Dn/kszxTkJBTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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