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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dce972d7771b4b172abdc086c645538244805ce65c0e04aa3739531960e4acad' 
  AND token = 'qCWVMtR86EQGFRRX5aitt6j9UteeEMQ5izkjToTWGcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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