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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '229fd95ab8e958b92c7d402303e7b07b2406a04f55f0e7d736a8def3e56f8360' 
  AND token = 'ZiAw5w/VnD5PixwnhCjSy1cfdu0k5R1eDIu/wD80coY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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