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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd464d954b76027e3c9eef3cf91b6f075c8cd783f1c2e561e7e652bf4fd11799f' 
  AND token = 'on9Sv9mlSV3lRCRF8dkVN8ROVopmMLKkArcXgpGqFG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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