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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7e0baf22fc9d88c938b0b065bb569ce4c9e6cc07a5ad8d7b6570dbb44c423af' 
  AND token = 'E5Flcd/lLk1LCBVlODxBslqYicEopQMxKvlaMgDK2JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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