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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a67334c1a96872d2544f5f664569d84ef3996d529de5f58c7b527e1300d6a9d5' 
  AND token = 'j3mcGnMGzqXit2T71cC1k8yqPpzxmC8VklDJD7+ONk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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