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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a6d5a02755e95d021fca03f04b3275c1b75f37604d73c520a149f518eda0bf9' 
  AND token = 'eCZhShFkZicbbd/2I5N/parN7+N+3eohYXCa7t262EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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