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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '674afd0fb3413ce3a03f30db6a8ceb50fba1c11d699079cff2061f59b04a9b6d' 
  AND token = 'jl6hb6qv05gmsj4CnNdrYLPs+aMobte7JV9Nbp4cFbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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