SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7a2dd33f49ebe011735bdf9cabf172687183e58d2e97b1110b542fe2e8bca09' 
  AND token = 'RVGI8mjLevkZzsB5UC9OPaqCRx63+aBgA5WW+0XmmFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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