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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8446895d713122a9bfe7359d38c9803968266633c86a4d0963a4ba57902529e5' 
  AND token = 'd0lXgG1cAVTpGsy3IPCagsQqIcA7V0S1oaTX7j4d3Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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