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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4c7da91008384e8887b5680493b3d7369a3ade3c16e17d8b61de558850d504d' 
  AND token = 'yrSPms8M1AU6GRQtp/qoVlbtqK0+FoOnPgSdOtbGeIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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