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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe401bb338792a51a2680939580fb3b9feacff9a58365f760201ae56f4797eac' 
  AND token = 'DI3qnti/CtdUI/Wi5062epqSgT4/JApndMQLa5xByQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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