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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44e64e3b1cd1481f21020122d051ec1558ef3ab5fecf875e86bc7baba660ae71' 
  AND token = 'PnbvhLEC/sWiM/p6syyPLjnxlhYWbkSaC6AJIjA/GS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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