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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c40705ad76cfccb212a9c9288c9186704ddb14a77db49c281fb7d0f7d675e651' 
  AND token = 'lLztcg7tQc/o5EB61loh984cPTFqK1mPRiyISKrw9to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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