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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e39b5e224812da1ef1637aeec597e2402299131828c5e4406b60c4858a99910' 
  AND token = '0vjxCIt5qRklZStn3siaN4mNM75/ZLv9MdHmisQahbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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