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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d7d40f9b9ce8a973806b687288b1eb96b7844b7d38e443036400bf92fd60dc1' 
  AND token = '5jmaRZ5SVaMWftEKtB3di5Ab7//A68yCVNPIr2OMIWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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