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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c3f6c72edf46f881f65c50a93a6843e4d7c05cf4afab3ccd320f7b33af2ad64' 
  AND token = 'ihHUktX/QxpnJibjYekxeGbVsqMMqdWV/S0g3INTUm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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