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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bad8703edfb52eb440c687e5efc334cc2cc0f8504720aded5e71add4ad14f835' 
  AND token = 'TEsrZC8dDLWYBKnd3AfRX4Ws8MV5140OYVW7ARncauM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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