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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bded42d7c8c6c9dfe7e1bd89e942d2e76d1c0dbb922785505035d4b40163a99c' 
  AND token = 'u8jVMGfRr3VTriyKLwd2uzE4AG9d9W9lztEqBxspoz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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