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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21b6c618b537d02ccdcae90b9b6c91dedcb52bd6bfe920762b15c871467769cd' 
  AND token = 'WTVkJ19xNyHpnlSVCcPjGPnEHmD75LZfUWSJ9NK3H7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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