SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bf224a0300b744d1fc15449e4ec2e629bb0352c73706a218f2bf57a16555db7' 
  AND token = 'w6uvPiMqmOaBfAYg1eZ9MJysgUuoMkwjg3fey83/tqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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