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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86fde45ed436f02f5feefe44be80289c4eeabdf05f7d4ca882ca860c5ab169f2' 
  AND token = 'q2AxpSSF32QzLzEj5sxya6WhHUiv/dd1qUeQu3ZOtIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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