SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc730e72683033f54c90c704291485271ace89cbd88b57f80393e1d9267d6fae' 
  AND token = 'BUQ4ZVeXIPpLYTSoF131wgO1+M0Pi1GU8P71KcOAnnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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