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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d64863ebcb25e27f330772da99dc160f2483cdfd043ceeed7fd78ce8878f424' 
  AND token = '3Ydvldi4sWHM+MORQehe/VSodERyRRJI5vJEzidkflM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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