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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af39e756aa2af8d7d442e35aea84616ed82abdd05b41f1f92bc842b977d80e33' 
  AND token = '2ex1RaJZctX6bWjtDpD1mSmpuvOmZ+Q8OJTteOoohAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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