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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '162b776dbf6b061964385386c25ed8ffc653827dcb76c5c8b66d9aa9eb5bb234' 
  AND token = 'KLplWNPefL7ywH5dt1tBoJwD1OjVjXLAIAS2ieWJZqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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