SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e7d629c993b118de7f4d6c8b8f044427fd205b4612470164a6ba8437c95e459' 
  AND token = 'Pxx3rZBHcuV77WuFvsZyrg7z8PQowj2FKTV/basuG7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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