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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a0157e3691cab5f17f91a7f6536e3cc1d86743e988bf99b531fb9d19f957c94' 
  AND token = 'w2fMnlw86mUMbgde17MwMNm6XivGhz5hwZalVZ+o2kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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