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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d9fb89d7e22363a502f1c3fdfe204139424cbeebf5e13e220c8e879e586170f' 
  AND token = 'aaPLFVFJR8/7AUPDWmV66ieyOn2ayZ9Wvy9iYzMf2co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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