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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3352a718f668360a5c3577f689f365165887114cfec1e4e93d318eb1ab02dca4' 
  AND token = 'Yi954kRH0sU6qYvYZsyKhrex69RwXshbMcWnnBVyMS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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