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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92acaf009cb4e4ccb6f8d6d3b2cc3b60566f516f558e3b9f78b21fe2a4fa24ba' 
  AND token = 'm4yE9mzR0PsuBdz4Ssw/D/vkZ3lGyIPf7pcQyGScyAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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