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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17286147153a56a5b19d8b543a26fb6acc535927ff008889cf94f00be58f10e1' 
  AND token = 'AfFN90tofHTCCsFS1DaGDyhI9tNaBPVa56CRSBw33QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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