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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6df3c9c3b8e024cd31439eb1a40daf4d0e827bc8311d6a9e1a2430d1103b803f' 
  AND token = 'HD6VGx6/h7zrcYjffgSg4n1QYtMZPzTJRckIF70kcG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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