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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d1c0d857b2f809125cd5612152bc84fec40704f4d4e57b8fd0e623961c4596f' 
  AND token = '48prs2y33ZOws92Hy5ZdorGUEtxnkArgXfrBGZtyG1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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