SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb8bd3fa12aa77b196b3e505000828007c64103717fc9e923b36cc8071c87a33' 
  AND token = 'jkgIRdAOAGD7z7Y5SqXxGuZ5N/F+Vbhlslv3Er4/i2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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