SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b34f8668995c5ea88ad1ee03d3214219f7e25fb840f019f22642588899c172f4' 
  AND token = 'q/qeYfzHKiHHRZUbnFFwFj52G86DpITSQ2kMMmvBT/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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