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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50c11a46e2f7eee736ab8aca8937a1cef99b1266a87db37088c6206aad0277c5' 
  AND token = 'H34p2K4kz8dp+ZTnB/82G4kvraa4QzFx3d8EEJ7El4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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