SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94bbf11d0cd98754a515d5b6d61cd2c74dfa7bea65fdb8ea58a5d570dde3e0b6' 
  AND token = 'Gqq2DJQ3XNzlDVTnGhcpYmgLpNlEFFwWIGtYQgWp6Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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